[sr-dev] [kamailio/kamailio] dmq: wait for a 2nd failed ping before deleting a node (#1840)

[Federico Cabiddu]

I discovered the problem exactly because I wanted to fail quickly, having a global fr_timer of 5 s. 
IMHO the patch as it is doesn't affect the capability to fail quickly since a node is taken off the nodelist for message broadcasting immediately, except for the ping. I would say that it affects the recovery speed, since a two pings cycle is needed before a node is added back in case of a temporary failure.
A modparam can be added to enable this, along with the caveat in the doc that a race condition can happen due to the combination of fr_timer and dmq ping interval.

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